Solving double and half angle identities | Q4 P1 | 11A | EoT2 |

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G11A Question 4 Find values of sine and cosine by using half-angle identities
EoT2 Part 1: Multiple Choices (MCQ)

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great video sir, i wished u showed how to get sin θ/2 and cos θ/2 for the tan questions, i tried using their equations but it only gives me math error on calculator so im confused which equation am i supposed to use

jfvirdv
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HOW WE CAN GET THE SIN and cos FROM ((TAN= -2)) question 16 please I need to know how🥲

manal