Question

sin a = sin q show that cos a= cos q,

Answer 1

Answer:

Given that,

Sina=sinq

Squaring on both sides,

Sin²a=sin²q

Use the identity,

Sin²x+cos²x=1

1-cos²a=1-cos²q

-cos²a=-cos²q

Cos²a=cos²q

Cosa=cosq

Hence proved....

Step-by-step explanation:

Hope it helps you frnd......

Answer 2

Given:

sina=sinq

here, sina=√1-cos^2a

sinq=√1-cos^2q

so, √1-cos^2a=√1-cos^2q

squaring both sides:

1-cos^2a =1-cos^2q

Hence, cosa=cosq

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