How much is 100 degrees centigrade

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• 1. What is the value of sin20 · sin30 + cos30 · cos20? 20,30 are degrees
• 2. The solving process of cos20 / 2cos10 ° minus sin20%
• 3. Vertical relationship If PA ⊥ BC, Pb ⊥ AC, then the projection of point P on plane ABC is ⊥ ABC_____ 2. P is a point outside the plane where △ ABC is located. If PA = Pb = PC, then the projection of P on the bottom surface is____ 3. Given that three line segments intersect at the same point P, the line segments PA, Pb and PC are perpendicular, and a, B and C are in the same plane, P is outside the plane ABC, and pH is perpendicular to the plane ABC at h, then the perpendicular foot h is △ ABC____ (inner / central / perpendicular / outer) 4. In the cube abcd-a1b1c1d1, e and F are the midpoint of edge Aa1 and CC1, respectively Please use the three perpendicular theorem to solve the fourth question in detail
• 4. It's depressing that I didn't bring the book with me Not too much. It's better to write down one point at the end of each summary on no more than one piece of paper Three lines per chapter... No books on holiday
• 5. Exercise 3.3 on page 110, the first question of the last question in group B I have worked out is (4), the title is that the vertex a (5,1) of △ ABC is known, the equation of the line where the central line cm on the edge of AB is 2x-y-5 = 0, and the equation of the line where the high BH on the edge of AC is x-2y-5 = 0 (1) The coordinates of vertex C; (2) The equation of the straight line BC
• 6. Taking the vertex of the quadrilateral ABCD as a (m, n) B (6,1) C (3,3) d (2,5), the values of M and N are obtained, so that the quadrilateral ABCD is a right angle trapezoid
• 7. If a line is parallel to a plane, is it parallel to all the lines in the plane or any line? What is "all" or "any"
• 8. In △ ABC, B = 60 ° and B2 = AC, then the shape of △ ABC is_______ ．
• 9. Fundamental theorem of plane vector If the point D is on the edge BC of the triangle ABC, and the vector CD = 4, the vector DB = m, the vector AB + N, the value of 3M + n Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent..... Urgent
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• 11. What is sin130 ° and sin11.7 ° equal
• 12. Sin65 * cos20-sin65 * sin20 please note that the latter two are sin. I need a process. Thank you
• 13. Do you know how much sin65 ° * cos20 ° - sin65 ° * sin20 ° is equal to
• 14. How much is sin65 °× cos20 ° - sin65 °× sin20?
• 15. I don't have a calculator. It's urgent
• 16. Who's bigger, sin 15 or sin 20
• 17. The mercury surface of the thermometer is at 38 degrees centigrade. A student uses the same thermometer to measure the questions of a, B and C. The results show that a is 38 degrees centigrade, B is 38.5 degrees centigrade and C is 39 degrees centigrade A. A's temperature must be abnormal B. B's questions must be abnormal C. three students' questions must be abnormal d. A's questions must be normal Explain the process of thinking
• 18. The temperature range is between 38.9 ℃ and 41.1 ℃, expressed as a ± B
• 19. -9 degrees centigrade Hurry
• 20. In the form of a ± B, the growth rate is between 35% and 36%, and the temperature is between - 38.9 ° and - 41.1 ℃