By simplifying sin (α + 30 °) + sin (30 ° - α) cos α___ ．

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• 1. Simplifying sin ^ 2 A + cos a * cos (60 + a) - Sin ^ (30-a)=
• 2. An acute angle trigonometric function problem If the adjacent sides of the parallelogram are 10 meters and 15 meters long respectively, and their included angle is 60 degrees, then the area of the parallelogram is?
• 3. The problem of two simple trigonometric functions with acute angles Given that angles a and B are the two acute angles of RT triangle ABC, Sina and CoSb are the two roots of the square of equation 2 (x) - MX + 1 = 0, then how many degrees is angle a = and how many is angle m? Given that angle a is an acute angle, Tana = root 3, then sin (1 / 2) a =?
• 4. Calculation of trigonometric function of acute angle In this lesson, I didn't come. The teacher left my homework. I'll go to class later. 1. Calculate the sine, cosine and tangent of the two acute angles in the following right triangle. 2. In RT △ ABC, if the length of each side is doubled, what's the change of the sine, cosine and tangent of the acute angle a? 3. As shown in the figure, in RT △ ABC, angle c = 90 °, AC = 8, Tana = 3 / 4, calculate the value of sina and CoSb If I can't send the pictures of question 1 and question 3, just answer the answers of question 2
• 5. Acute trigonometric function 1. Simplification: | sin40 ° - 1 | + √ (1-cos ^ 240 °) 2. Assume 0 degree
• 6. Given the line y = 3x, find the sine value of the angle (acute angle) between the line and X axis
• 7. The slope is equal to () A sine B tangent C cosine D reciprocal of tangent
• 8. On the solution of sharp angle trigonometric function~ 1. In RT triangle ABC, if angle c = 90 degrees, a + C = 4, cos = 3 / 5, then a =, B =, C = area of triangle ABC? 2. There are two boats on the sea. Boat a is due south of boat B. boat a sails 60 degrees north by east at the speed of 8 knots. Boat B sails 5 knots due east, 3. In RT triangle ABC, angle c = 90 degrees, D is a point on the edge of BC, De is perpendicular to point E, angle ADC = 45 degrees, if de ratio AE = 1:5, be = 3, calculate the area of triangle abd 4. In order to alleviate the parking problem, an underground garage is planned to be built in a certain unit, and the architectural designer has provided the design schematic diagram of the underground garage. According to the regulations, the height limit sign should be posted above the broken road of underground parking, so as to inform the parking people whether the vehicle can be safely used (AB = 9 meters, BC = 0.5 meters) to indicate the height limit, please calculate according to the figure (the figure can't be uploaded, please draw it yourself)
• 9. Can you make 45 degree and 135 degree angles with round pieces of paper
• 10. As shown in the figure, it is known that △ ABC is inscribed in ⊙ o, ∠ C = 45 ° and ab = 4, then the radius of ⊙ o is___ ．
• 11. Simplify cos (α + 30 °) cos (α - 30 °) - sin (α + 30 °) sin (α + 150 °), Simplify cos (α + 30 °) cos (α - 30 °) - sin (α + 30 °) sin (α + 150 °),
• 12. Given sin α = 12 / 13, α ∈ (π of 0,2), cos β = - 4 / 5, β ∈ (π of 2), find cos (α - β), sin (α - β)
• 13. Sin (a + 30 degrees) - cos (a + 60 degrees) / 2sina=
• 14. sin(a+30°)+cos(a+60°)2cosa=______ ．
• 15. Sin (30 + a) = - 4 / 5, then cos (A-60)=
• 16. (3y-6)(-y) (-3x)(4x²-4/3x+1) (-xy)(2x-5y-1) 5x(2x+3)+x(x+1) 2z(a² +3a-2)-2(a³+2a&sup The title of the book （3y-6)(-y) (-3x)(4x²-4/3x+1) (-xy)(2x-5y-1) 5x(2x+3)+x(x-1) 2a(a² +3a-2)-2(a³+2a²-a+1）
• 17. How to decompose 3A & sup2-12a + 12 = 0
• 18. To simplify the evaluation, we know | 2a-b + 1 | + (3a + 3 / 2 b) & sup2; = 0, find the algebraic formula B & sup2 / / A + B △ A / a-b - 1) x (a - A & sup2 / / a) Note: B & sup2 / A + B is the square of a + B Find the value of the Algebra B & sup2; / (a + b) / {A / (a-b) - 1} x {a - A & sup2; / (a + b)}
• 19. Given that 2a-3b + C = 0, 3a-2b-6c = 0, find the value of a & sup2; + B & sup2; + C & sup2; / 2A & sup2; + B & sup2; - C & sup2
• 20. （a+b/a-b）² * 2a-2b/3a+3b - a²/a²-b² ÷ a/b